Coffer-dam for vessels



(No Model.)

G. CLARKE.

COPPER DAM FOR VESSELS.

No. 398,232. Patented Feb. 19, 1889.

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N. PETERS. PhnbLhhugrzlpbw, Waxhinglou. D. C.

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GEORGE (.LARKE, OF JERSEY CITY, NElV JERSEY, ASSIGNOR TO HORACE G. PHILIPS, OF \VILMINGTON, DELAIVARE.

COFFER DAFVI FOR VESSELS.

SPECIFICATION forming part of Letters Patent No. 398,232, dated February 19, 1889. Application filed December 14, 1888. Serial No. 293,552- (No model.)

To aZZ whom it may concern: other arm of the lever E is attached a verti- Be it known that I, GEORGE CLARKE, a citical rod, E which passes through a handled zen of the United States, and a resident of nut, 6 at the upper end of the gate. This Jersey City, Hudson county, New Jersey, have rod is threaded at its upper end and adapted 5 invented certain Improvements in Coffer to said handled nut 6 on turning which the Dams for Vessels, of which the following is a gate can be moved into or out of position.

specification. The handled nut has its bearing in a block My invention relates to certain iniprovesecured to the main gate.

ments in Coffer-dams for vessels, for which H is the second auxiliary gate hung longi- IO Letters Patent were applied for by me on the tudinally to the main gates by hinges h. This 3d day of October, 1888, Serial No. 287,10i. gate makes a butt-joint with the gate D at My present invention relates particularly the point 56, so that the two gates fit comto the construction and operation of the suppletely the irregular shape of the hull of the plemental gates on the main gates of the cofvessel. To this gate is attached a bar or shaft,

15 fer-dam and the bolts for securing the main I, turning in bearings '2' 1 secured to the main gates when opened. gate of the coffer-dam. On this shaft is an In the accompanying drawings, Figure 1 is arm, 1", connected to a vertical shaft,l, which an end view of one-half of a cotter-dam, showpasses through a handled nut, 1' which is also ing my improvements. Fig. 2 is a section on journaled in a bearing on the main gate in 20 the line 1 2, Fig. 1. Fig. 3 is a section on the the same manner as the nut 6 On turning line 3 i, Fig. 1, and Figs. 4 and 5 are views the nut the shaft will be raised or lowered illustrating the bolt for securing the main and the gate will consequently be opened or gates in an open position. closed.

Referring to the drawings, A is the coffer- The hose, instead of extending around the 25 dam. B is one of the main gates hinged to edges of the auxiliary gates, passes around said cotter-dam at b. The gates are out out the opening, and short sections of hose may at C to allow for the screw-shaft projections be attached to the auxiliary gates themselves on the hull of a twin-screw steamer. The to prevent leakage as much as possible beshape of the gates corresponds with the shape tween the hull of the vessel and the gates.

0 of the hull of the vessel in cross-section. A The bolt M, for securing the main gates in So tube or hose inserted in the groove in the an open position, has at its rear a lever, m, edge of the gate, and is preferably expanded pivoted thereto, which engages with a rack, in the same manner as described in the afore- N, on the cotter-dam, so that the bolt can be said application. I have found that it is forced into position by the lever when neces- 3 5 preferable to hinge the auxiliary gates to the sary. 8 5

main gates rather than slide them in position, I claim as my invention as in the above-mentioned application. 1. The combination of the main gates of a D is one of the auxiliary gates hung in a cotter-dam, of auxiliary gates hinged thereto, vertical position and allowed to swing out and mechanism for moving said gates into 40 and against the face of the main gate. This and out of position, substantially as described. gate is hung by hinges cl to the main gate, 2. The combination of the main gates of a and the edge of this gate is curved to correcoffer-dan1, of the vertical hinged auxiliary spond with the contour or shape of the hull gate, andalongitudinal hinged auxiliary gate, of the vessel at the point where the gate both extending to and meeting at the point 5 would come in contact with the hull when the 00, so as to entirely close the irregular opening cotter-dam is placed in position on the stern for the screw-shaft projections of the vessel, of the vessel. This gate is moved into and substantially as described. out of position by means of a two-armed le- 3. The combination of the main gate, an ver, E, pivoted to the main gate 6 and conauxiliary gate hinged thereto, the two-ar1ned D 50 nected to a stud, cl, by a rod, E. To the lever, one arm connected to said gate and the IQQ other arm connected to a vertically-movable In testimony WhereofIhave signed my name screw-shaft, and a handled not for said shaft, to this specification in the presence of two subon turning which the gate will be opened or scribing Witnesses. closed, substantially as described.

5 4. The combination, with the coffer-dam, of GEORGE CLARKE.

the hinged main gate, a bolt on one and adapted to pass into keepers in the other, a 'Witnesses:

lever on said bolt, and a rack with which the HENRY HOWSON, lever engages, snbstantially as and for the HARRY SMITH. 1o purpose described. 

